Electric lamp



ELECTRIC LAMP.

Patented Apr. 14, 1885,..

2 Sheets-Sheet 2. M. N. LYNN.

ELECTRIC LAMP.

(No Model.)

No. 315,524. Patented Apr. 14, 1885.

A it consists, essentially, in the manner of supdo hereby declare the following to be a full,

` tal arm, B', fastened to the vertical post B2, and

i UNITED i STATES PATENT OFFICE.

MIRABEAU N. LYNN, OF RISING SUN, INDIANA, ASSIGNOR TO THE OIIIO v POWER AND LIGHT COMPANY, OF DAYTON, OHIO.

` ELECTR! G LAM P.

SPECIFICATION forming part of Letters Patent No. 315,524, dated April 14, 1885.

Application filed November 5, 1883. (No model.)

To a/ZZ whom #may concern:

Be it known that I, MIRABEAU N. LYNN, of Rising Sun, in the countyl of Ohio and State of Indiana, have invented certain new and useful Improvements in Electric-Arc Lamps; and I clear, and exact description of the same, reference being had to the. accompanying drawings, forming a part of this specification, and to the figures and letters of reference marked thereon. u y' My preselit invention relates more especially to that class of electric-arc lamps containing two movable carbons which are caused to simultaneously approach or recede to feed the carbons or form the arc and at a rate pr'portional to the consumption of the carbons; and

porting and mounting the operative parts of such a lamp, and also in certain improvements the mechanism for controlling and eiiecting in the simultaneous movements of the carbons, all as hereinafter more fully set forth in the claims.

In the accompanying drawings, Figure l is a side elevation, partly in section, of a lamp embodying and illustrating my invention. Figs. 2 and 3 are detail views of the guidingtube for the carbons. Fig. 4 is a side elevation, partlyin section, of the winding-drum and its attachments. Fig. 5is aview of the brake-leverand connections. Fig. 6 is a view of the brake-lever and its connections, taken on the opposite side from Fig. 5, showingfthe lever elevated and the brake, applied.

Similar letters of reference `in the several. figures indicate the saine parts.

The tubular guides A A', in which work the carboncarriers, are supported at or near the eXtreme end of the bed-plate B, the upper guide, A, being secured to a curved horizonthe lower guide, A', being bolted to the edge of the bed-plate. These guides A and A are each made in two sections, c c', provided with flanged edges and united by thumb-screws, so that one section can readily be removed to permit access to its interior. Vithin these guides work the carbon-carriers O, each provided with a roller, c, slightly less in diameter than the interior of the guide, and the latter is provided with friction-rolls a2 to guide .bed-plate back of and support the carbons. In the rear section of each guide is cut a longitudinal slot for the passage of the arm c' on the carbon-carrier, and to this arm is attached the cord or other suitable operating mechanism for moving the carrier up and down in the guide.

rlhe manner of constructing, arranging, and supporting Vthe guide-tubes and carbon-car riers, as above described, is advantageous in that the carbons are projected at about equal distances above and below the bed-plate whereon the operating mechanism is located. Morcover, the carbon carrying and guiding mechanisn ispractically isolated from the feeding mechanism, and the carbons and their carriers are always accessible for inspection and repair. l

The operating mechanism,l which is here shown in connection with the guides and carriers above described, is mounted upon the the vertical post B2. It consists, essentially, of fixed shaft D, supported in suitable bearings, d* df, secured to the bedplate, and carrying the drum E, which latter is free to turn upon said shaft.` The drum E is composed of ive sections or divisionsthe two outer and smaller sections or pulleys, c c, upon which the cords ff are wound in opposite directions, the differential pulleys or drums e' e, to which the connecting chains f' f' are fastened, and the relatively narrow but enlarged pulley or brake rim ft', upon which the brake mechanism operates. rIhe cords or chains f f are wound in relatively opposite directions upon the drums or pulleys e e, the cord attached to the lower carbon-carrier passing over a pulley, g, supported on the bedplate, vand being wound upon the smaller drum or pulley, a2-while the other chain, after pass` ing over a pulley, g', mounted in the top of the post B", is fastened to the larger drum or pulley, e. The relative diameters of the two drums or pulleys e' eIl are such as will compensate for the unequal consumption of the carbons, so vthat as the drums revolve the traverse of the upper positive carbon will be about twice as great of the lower negativevcarbon, and as the leverage exerted by the dependent carriers in opposite directions is greatest on the side attached to the larger drum the other carrier is made relatively heavier suiiiciently so to compensate for the difference in the leverage IOO and to maintain the carriers in equilibrium. I the lever N pulley.

To the shaft is secured a crank-arm, d, npon whichis mounted a sleeve, d, provided at one end with a pinion, di, co-opcrating with the internal toothed-ring, di, secured to the drum E. A cord, h, is attached to and wound upon the sleeve d, the opposite end being secured to the larger end of the cone-pulley H, constituting a fusee and barrel, the design being to secure a constant and uniform pvressure or force upon the drum in the direction necessary to effect the simultaneous approach of the two carbons. Not only is a practically constant and uniform feeding force thus maintained, but the mechanism is adapted to be reset when run down by the simple act ol inserting the earbons,for when the lower carboncarrier is drawn down to permit the insertionfof a carbon the drum is rotated and the cord unwound from the pulley onto the sleeve, thus winding up the spring.- As thespringtends at all times to draw the carbons together, itis necessary that some means be provided for eontrolling such movements to form andpreserve the normal arc, and with this end in View I have applied an automaticbrake to the drum, controlled by the current, and acting'in oppositon to the spring with a force varying in proportion to the resistance of the are. This regulating and controlling mechanism is composed of an electro-magnet or solenoid, -M,in-l eluded in the lamp-circuit, and suspended by a pivot to a support, S. Within said solenoid is a core-piece, S, carrying a roller, s, at one end, and working between guide-rollers 8 s', fastened to the end of the solenoid, and to the lower end of the core 'is'pivoted the brake-lever N, which is sustained and balanced by the opposing springs s1 s2, extending the one from the solenoid to the lever and the other from the lever to the bed-plate. To the lever N are pivoted the'links r rthe opposite ends of said links being pivoted, respectively, tothe curved links or levers R R2, extending the one above-and the other'beneath the pulley c and to one side of the brake-rimf". The links cr levers R ltare pivoted together on thc axis y of a roller, R, which latter rests in contact with the brake-rimfZ. The lever R earries a similar roller, r, and the lever R2 a rubber or friction roller or block, T. Both of said rollers r and T making contact with the brake` rim. The lever N is extended beyond the point of attachment of the links r r2, and curved, as shown, to clear the pulley e2, and the end of said lever is arranged to bear upon the pivot y of the roller R when the former falls to the feedingpoint. In this position 'the outer end of the lever is sustained upon the brake-rim by the rollers r R,lever R', and link r,the friction-rollerT restingbut lightly, if at all, in lcontact witlfthe brake-rim. When is elevated by the solenoid,it first causes a backward movement of the levers R R2 upon their sustaining'rollersl r R, until the end of the lever clears the pivot of the roller R, and the further movement ot' the lever N operates through the links r r2 to draw thel ends of the levers MR2 together, thus causing the brake-rim to be rmly grasped between the rollers r, R, and T, the latter being made ofrubber or some elastic matcrial,so as to increase the friction or bite77 upon the brakerirn; The springs s eZ operate not only to in a measure sustain and balance the lever N, but also to insurethc action of the lever N upon the levers R l't2 and insure the proper contact with the brake-rim.

The levers N, R, and Ri, with the rollers arranged in the manner shown and described, constitute an efficient brake mechanism,which will readily grasp and retain the drum when the lever N is elevated by the attraction of the solenoid, but will-afford little or no opposition to the rotation of the drum when the lcver falls. YVhen there is no current passing through the coils of the solenoid, the lever is 'sustained by the rollers It r and the upper spring, s2, the rubber roller T resting but lightly,ifat all, against thebrake-rim f2,- hence the druin is free to be revolved by the spring h through the connecting mechanism, such as described. As soon, however, as the current is established through the solenoid by the contact oftheearbons, the lend of the lever is elevated, the brake-rim is grasped by the rubber roller T, and the drum is moved back against the power of the spring. This backward movement of the drum continues until the carbons have been separated a suicient` As theeardistance to form the desired are. y bons are thus separated the Apower of the solenoid is decreased in proportion to theinerease" in the resistance of the are until a point is reached where the force of the spring It and the power of the solenoid will exactly bal- ICO IIC

ance each other, and the carbons will be held at the proper distance apart to form the desired arc.

As the carbons are consumed, and the resistance increased thereby, the power of the solenoid gradually deereascs,'and the force of the spring, which is at all times constant, pre dominating, the carbons are fed together proportionally. This movement of the carbons under the differential action ofthe two opposing forces, the one constant and the other varying in proportion to the resistance of the are, continues until the lever in its downward movement relieves the grip of the rubber roller T, and permits a new i'ced to be made.

rllhe springs s s2, acting in opposition to each other upon the-lever, tend to support and retain the latter in position, at the same time relieving the friction upon the two rollers, and permitting vthe core of'the solenoid to be raised and lowered without allowing it to become displaced or fall too low".

. The carbons usually employed in lamps of this kind are of unequal size and weight, and I 7. In an electric lamp, and in combination although the carbon-carriers are balanced, there would be more or less disturbance of the balance by they variation in the relative vweight of the upper' and lower carbons. To provide for this difficulty, I have {added the two pulleys e e to the drum E, and wound upon them, but in relatively opposite directions, the cords f f, having the tension-springs u u attached thereto.

As thus arranged, one of the springs is adjusted to balance the upper carbon and. the other the lower, no matter how much they may differ in weight when inserted in the carriers.

The cord to which the spring for .balancing the`lower carbon is attached is unwound as the carbon is consumed and fed upward, and thetensionof said spring is thus decreased proportionally to the diminution in weight. On the other hand, as the upper carbon decreases in weight and is fed forward, the tension of its balancing-spring is somewhat increased, but in a uniform degree, thus rendering the overbalancing power practically uniform.

Having thus described my invention, what I claim as new is 1. In an electric lamp, the sectional and slotted guide secured to the vertical post by the bent arm, in combination with the carboncarrier, substantially as described.

2. In an electric lamp, and in combination with the carbons, the carbon-carriers, intermediate connecting mechanism,and the differential pulleys, the fusee, barrel, and connecting mechanism, whereby e. constant and uniform feeding force is applied to the pulleys, substantially as described.

3. As a means for eifecting the uniform rotation of the .mechanism for controlling the feed of the carbons, and in combination therewith, the fusee, barrel, and operating-spring arranged to operate upon the carbon-feeding mechanism, substantially as described.

4. In an electric lamp, and in combination with the carbon carriers, the differential pulleys and connecting-chains, a spring-motor operating with a constant and uniform force to feed the car-bons, and a brake actuated by an electro-magnet and operating in opposition to the spring-motor, substantially as described.

5. In an electric lamp, and as a means for effecting tlierfeed of the carbons and formation of the are, a rotating drum with which the carbon-carriers are connected, a springmotor operating upon said drum with a uniform power,and a brake actuated by an electromagnet operating upon said drum in opposition to the spring-motor, substantially as described.

6. In an electric lamp, and in combination with the rotating drum, differential pulleys, connecting chains, and carbon-carriers, the fusee,and barrel located within the drum and geared thereto, substantially as described.

with the carbon-carriers, connecting-cords, and rotating drum provided with the differential pulleys, a spring-motor acting upon said drum in a direction to cause the approach of the carbons, a brake-rim also applied to said drum, anda friction-brake and actuating electro magnet, said brake being applied in opposition to the spring-motor with a force proportional to the resistance of the arc, substantially as described.

8. In combination with the rotating drum, attached carbon carriers, spring feeding mechanism, and brake mechanism, the balanced carbon-carriers, the small pulleys, reversely-wound cords, and attached springs, substantially as described.

9. In an electric lamp, and in combination with the rotating drum, attached carbon-carriers, and feeding mechanism, the lever carrying the links, friction-rollers, and the rubber roller, substantially as described, said rollers operating on a brake-rim attached to the drum and the lever operated by an electromagnet, as and for the purpose set forth.

l0. In an electric lamp, as a means for controlling and effecting the movements of a drum to which the carboncarriers are attached, and in combination with said drum. a lever operated by an electro-magnet and supported upon a brake-rim by two rollers, one journaled in the lever and the other in a supplemental lever pivoted at one end to the first-mentioned lever and at the other connected by a link, and a third lever connected to the first-mentioned lever and carrying a friction-clamp applied to and operating upon the brake-rim, substantially as described.

11. In an electric lamp, the combination of the carbon-carriers, the tubular guides within which they move back and forth, the frictionwheels on the carriers,and the friction-wheels mounted on the tubes and adapted to support the inner ends of the carbons, substantially as described.

I2. The combination of the tubular guides in which the carriers work with the carriers having the arms projecting through the slots in the tubes, the cords to which said arms are connected, the pulleys and the shaft, and the differential pulleys for imparting to the carriers simultaneous motions of different degrees, substantially as described.

13.. The combination,with the movable carl riers and the main shaft, of the pulleys by which the carriers are given simultaneous though unequal motions, the drum mounted on said shaft, and the fusee and barrel motor connected to said drum, substantially as described.

In witness whereof I,.the said MIRABEAU N. LYNN, have hereto set my hand this 22d of October, 1883.

MIRABEAU N. LYNN.

/'itnessesz C. P. JACOBS, H. H. FULTON.

IIO 

